Typewriting machine



Feb. 26, 1935. I H. A. AVERY 1,992,174

TYPEWRITING MACHINE Filed Sept. 16, 1935 2 Sheets-Sheet 1 8 40 B a? f l3 7 71a: J0 add v I I if 7 I 6'2 67 a3 #19 110 73' @951 J76 254 ygf ATTORNEYS Patented Feb. 26, 1935 UNITED STATES PATENT OFFICE TYPEWRITING MACHINE Application September 16, 1933, Serial No. 689,717

11 Claims.

This invention relates to improvements in typewriting machines and has for its principal object to provide improved means for controlling the travel of the platen carriage. Another object is to provide simple, light and compact means for controlling carriage travel in small portable typewriting means.

To the foregoing and other ends which will hereinafter appear the invention consists in the arrangement of' parts, features of construction and combinations of devices set forth in the following description and particularly pointed out in the appended claims.

In the accompanying drawings, illustrating the preferred embodiment of the invention,

Fig. 1 is a plan view showing so much of the machine as is necessary for an understanding of the present invention, certain parts being broken away;

Fig. 2 is a sectional view on the line 2-2 of Fig. 1;

Fig. 3 is a sectional view on the line 3-3 of Fig. 4;

Fig. 4 is a fragmentary view showing in plan on an enlarged scale certain of the parts in the right hand portion of the machine;

Figs. 5, 6 and 7 are detail views showing in front elevation certain associated parts; and

Fig. 8 is a sectional view on the line 8-8 of Fig. 1.

The main frame 10 of the machine, which is surrounded by a suitable mask or ornamental casing 'part of which is shown at 11, has rigidly secured thereto a carriage bed 12 upon which travels a suitable platen carriage 13 in which is journalled a platen 14. The step by step letter feed movement of the carriage is controlled by a suitable escapement mechanism, preferably of the kind disclosed in patent to Avery, et al., No. 1,700,- 828, granted February 5, 1929. This escapement mechanism comprises the spring drum 15, a draw band or cable 16 which extends from the drum to an anchorage 1'7 on the carriage, a rack bar 18 on the carriage, a shaft 19 journalled on a bracket 20 held to the carriage bed, a feed pinion 21 fixed on said shaft and meshing with the rack bar, an escapement wheel 22 fixed on said shaft and controlled by the fixed dog 23 and loose or pivoted dog 24, and the escapement dog rocker jacent the rear end thereof is a transversely extending rock shaft 27 journalled in the main frame. This shaft is oscillated by the space bar and universal bar to actuate the dog rocker for single space letter feed movement of the platen 5 carriage. A rock arm or tappet 28 on the left hand end of shaft 27 is normally held'pushed back against a stop 29 on the main frame by the pendant arm of the dog rocker and is adapted to thrust said arm forward when the shaft is rocked to effect letter feed action of the escapement mechanism.

Near its right hand end shaft 27 is provided with a normally upstanding rock arm 30 carrying a transversely extending screw 31 at its upper end. The shank of screw 31 is normallyengaged in the rear end of a slot 32 in a fore-and-aft extending link 33, which link is drawn rearward by a spring 34. The forward end of the link is pivoted to the upstanding rock arm 35 on a transversely extending rock shaft 36 which is journalled in the main frame and carries a pair of forwardly extending arms 3'7 which support the space bar 38. Spring 34 normally holds stops 39 carried by lateral extensions of arms 37 engaged under stop parts 10 of the main frame. Said stops '39 are engageable with stops 40 on the main frame to limit downward movement of the space bar.

Between arm 30 and the right hand side of th frame 10, shaft 27 is reduced in diameter and has pivoted thereona yoke 41 provided with an upstanding rock arm 42 having an inwardly bent upper end which extends behind rock arm 30 to oscillate shaft 2'7 and is normally spaced slightly to the rear of arm 30. Yoke 41 is provided with an upstanding rock arm 43 connected by a link 44 to the universal bar '77 of the machine. The universal bar is journalled at 45 in the sides of the main frame and is depressed by a part 46 of each type bar act1on of the machine to actuate the escapement whenever a character key is depressed to type a character.

'It will beobserved that the escapement may be actuated by the universal bar without movement of the space bar, and that the actuation of the escapement by the space bar will not cause movement of the universal bar. The type bar action, and the mode of actuation of the universal bar thereby, are more fully shown and described in my co-pending application Ser. No. 586,319, filed Jan. 13, 1932, part 46 of each individual type action being a sub-lever of the type action.

Travel of the carriage on the bed is further controlled by suitable adjustable margin stops 4'7 and 48 on the notched margin stop bar 49 carried by the carriage, and coactive counter stop means carried by the main frame. A bracket 50 rigidly held to the main frame at the rear central part of the frame has end cars 50 holding a transversely -extending hinge rod or pin 6'7. A substantially flat up-standing sheet metal counter stop 51 for the margin stop is pivoted onthe hinge rod 67 by a pair of cars 51 curled about the rod and abutting the inner ends of ears 50 of the bracket. An upstanding sheet metal line-lock actuating lever 52 is pivoted between the ends to stop 51 by a horizontal fore and-aft extending pivot 53 above the, hinge rod, said ,lever lying against the rear face of stop '51, and having a forwardly extending contact lug 52 at its upper end for engaging a stop edge 51 of the stop 51 but normally held rocked away from said edge by a. spring 54 connectingthe lower end of the lever to a rearwardly offset pendent arm portion 51 of the stop which is normally abutted by the lever.

Margin stop 47 has a contact portion 4'7 adapted to strike a stop edge 51 of stop 51 to arrest return travel of the carriage and determine the left hand margin, while margin stop 48 has a contact portion 48 adapted to carry lug 52 against stop edge 51 of stop 51 to arrest travel of the carriage in letter feed direction and determine the right hand margin. The rocking of lever 52 before lug 52 strikes stop edge 51 actuates a line-locking lever 55 which extends foreand-aft of the machine in the rear right hand corner of the frame and is mounted between its ends on a vertical pivot 56 carried by the frame. A link 5'7 connects the lower end of lever 52 to therear end of lever 55 and normally holds the hook-like forward end of the lever 55 to the right of the path of movement of arm 43 of yoke 41. When lever 52 is rocked by stop 48, a spring 76 which is weaker than spring 54 rocks lever 55 to position its hooked forward end in front of and sufficiently close to arm 43 to prevent said yoke being rocked far enough by the universal bar to actuate shaft 27 and the escapement. The universal bar also prevents any type action from carrying a type to the printing point when the line is locked.

It is. sometimes desirable to actuate the machine to write in the margins, and for this purpose a margin release control is provided for the carriage. A margin release key lever 58 of bellcrank form is pivoted at the right hand side of the frame at 59 and has its upstanding rear arm connected by a rearwardly extending link 60 to the right hand end of a horizontally swinging and transversely extending lever 61. Lever 61 has a yoke-like intermediate bearing portion 61 fulcrumed on a vertical pivot 62 carried by the frame, and has a forked left hand end 61 embracing the pendent arm 51 of stop 51. When the margin release key 58 on key lever 58 is depressed after locking of a line the upper part of stop 51 and of lever 52 swing forward out of thepath of contact part 48 of stop 48 thusreleasing the line lock lever 55 for restoration to normal position. If the key 58* is depressed after arrest of return movement of the carriage, stop 51 swings out of the path of travel of contact part 4'7 of stop 47. A spring 63 connecting lever 61 to the frame, serves as a return spring for this lever, for stop 51 and for key lever 58. A stop lug 61 on lever 61 engages the rear part of the frame to limit return movement of the beforementioned parts by spring 63.

It is also desirable at will to change the single letter space jump of the carriage under control of the escapement to a multiple letter space Jump, as-for tabulating and similar work. For this purpose a tabulating control means is provided for the carriage. A sheet metal counter stop lever 64 is provided for coaction with suitable adjustable tabulator stops 65 carried by the notched tabulator stop bar 66 mounted on the platen carriage.

The counter stop 64 normally extends substantially vertically like stop 51- and is provided between its ends with a pair of pivot ears 64' curled around the pivot rod 6'7, the stop 51 being cut away between its pivot ears to provide space for stop 64 whose pivot ears engage the inner ends of the'pivot ears of stop 51. Stop 64 is provided at its upper end with a rearwardly projecting contact lug 64 normally out of the path of travel of the tabulator stops 65 on stop bar 66 but adapted to be placed in the path of travel of said stops 65 by rocking stop 64 on its pivot rod.

To rock stop 64 to active position and release the carriage from control of the escapement, a bellcrank tabulator key lever 68 carrying a tabulator key 68 is pivoted at 69 on the frame and has a pendent arm connected by a rearwardly extending link '70 to the left hand end of a horizontally swinging and transversely extending lever 71 located in the left hand rear portion of the frame. Between its ends lever 71 is provided with a yoke-like bearing portion '71 having a double bearing on a vertical pivot '72 carried by the frame. Lever '71 has a forked right hand end '71 embracing the lower end of stop 64 for rocking the stop. Near its right hand end lever '71 is provided with a stop lug '73 normally held against the rear part of the frame by a return spring '74 to position said lever, stop 64 and key lever 68 in idle position, and is also provided with a tappet lug '75 which extends behind and is normally spaced slightly to the rear of a pendent arm 25 of the dog rocker. When the tabulator key 68 is depressed, lever '71 first partly rocks stop 64 toward set position, and then as it finishes the complete rocking of the stop to set positionit simultaneously rocks the dog rocker far enough to place both dogs out of the plane of the escapement wheel thus freeing the carriage from control of the escapement. The freed carriage jumps in letter feed direction until the nearest stop 65 to the right of stop 64 engages stop 64 and arrests the carriage. key is released the escapement assumes control of the carriage and stop 64 returns to idle position. It will be observed that stops 51 and 64 are each rockable without moving the other, and that J actuation of the dog rocker by the tabulator key does not move any of the other devices provided for actuating the dog rocker.

A return spring '78 for the universal bar '77 normally holds a stop finger '79 on said bar engaged under a fixed stop on the main frame.

What I claim is:

1. In a typewriting machine, the combination of 'a main frame, a platen carriage supported on the main frame, an escapement for controlling letter feed travel of the carriage, margin stops carried by the carriage, tabulator stops carried by the carriage, a counter stop for the margin stops, 2. counter stop for the tabulator stops. a common fixed pivot on the frame for said counter stops, the first-mentioned counter stop straddling the second mentioned counter stop on said pivot,

When the tabulator a release key connected with the first-mentioned counter stop for rocking the same out of the path of travel of the margin stops, and a tabulator key connected with the second-mentioned counter stop and the escapement for releasing the car riage from control of the escapement and rocking said counter stop into the path of travel of the tabulator stops.

2. A typewriting machine having a main frame, a traveling platen carriage supported on the frame, a right hand margin stop on the carriage, tabulator stops on the carriage, a fixed pivot rod on the frame extending transversely of the frame. a counter stop for the tabulator stops loosely pivoted on said rod and normally out of the path of travel of the tabulator stops, a counter stop for the margin stop loosely pivoted on said rod at opposite sides of the first-mentioned counter stop and holding the latter against axial movement, means holding the second mentioned counter stop against axial movement, the latter stop being normally in the path of travel of the margin stop, a key connected to the first-mentionedcounter stop to rock the latter into the path of travel of the tabulator stops, an escapement for the carriage releasable by said key, and a key connected to the second-mentioned counter stop for rocking the latter out of the path of travel of the margin stop.

3. A typewriting machine having a main frame, a traveling platen carriage supported on the frame, a right-hand margin stop on the carriage, tabulator stops on the carriage, a fixed pivot rod on the frame extending transversely of the frame, a counter stop for the tabulator stops loosely pivoted on said rod and normally out of the path of travel of the tabulator stops, a counter stop for the margin stop loosely pivoted on said rod at opposite sides of the first-mentioned counter stop and holding the latter against axial movement, means holding the second mentioned'counter stop against axial movement, the latter stop being normally in the path of travel of the margin stop, a key connected to the firstmentioned counter stop to rock the latter into the path of travel of the tabulator stops, an escapement for the carriage releasable by said key, a key connected to the second-mentioned counter stop for rocking the latter out of the path of travel of the margin stop, a lever pivoted on the second-mentioned counter stop for rocking by the margin stop. and a line-locking latch operable by said lever.

4. A typewriting machine having a main frame, a traveling platen carriage supported on the frame, a right hand margin stop on the carriage, tabulator stops on the carriage, a fixed pivot rod on the frame extending transversely of the frame, a counter stop for the tabulator stop loosely pivoted on said rod and normally out of the path of travel of the tabulator stops, a counter stop for the margin stop loosely pivoted on said rod at opposite sides of the first-mentioned counter stop and holding the latter against axial movement, means holding the second mentioned counter stop against axial movement, the latter stop being normally in the path of travel of the margin stop, a key connected to the firstmentioned counter stop to rock the latter into the path of travel of the tabulator stops, an escapement for the carriage releasable by said key, a key connected to the second-mentioned counter stop for rocking the latter out of the path of travel of the margin stop, a universal bar for actuating said escapement, a line-locking latch for locking said universal bar, a lever pivoted on the second-mentioned counter stop for rocking by the margin stop, and means connecting said lever to said latch for actuating the latch to lock the universal bar.

5. A typewriting machine having a main frame, a traveling platen carriage supported by the frame, an escapement for the carriage, a rock shaft having a tappet for actuating the escapement to letter feed the carriage, a universal bar and a space bar each connected to said rock shaft to rock the latter without moving each other, a right hand margin stop on the carriage, tabulator stops on the carriage, a fixed pivot rod on the frame, a counter stop for the margin stop pivoted on said rod, a counter stop for the tabulator stops pivoted on said rod, a key connected to the first-mentioned counter stop to rock thev latter out of the path of travel of the margin stop, and a key connected to the second-mentioned stop to'rock the latter into the path of travel of the tabulator stops, said last-mentioned key being connected to the escapement to release the carriage from control of the escapement without actuating said rock shaft.

6. A typewriting machine having a main frame, a traveling platen carriage supported by the frame, an escapement for the carriage, a rock shaft having a tappet for actuating the escapement to letter feed the carriage, a universal bar and a space bar each connected to said rock shaft to rock the latter without moving each other, a right hand margin stop on the carriage, tabulator stops on the carriage, a fixed pivot rod on the frame, a counter stop for the margin stop pivoted on said rod, a counter stop for the tabulator stops pivoted on said rod, a key connected to the first-mentioned counter stop to rock the latter out of the path of travel of the margin stop, a key connected to the second-mentioned stop to rock the latter into the path of travel of the tabulator stops, said last-mentioned key being connected to the escapement to release the carriage from control of the escapement without actuating said rock shaft, a lever pivoted on the first-mentioned counter stop for rocking by the margin stop, and a line-locking latch for the universal bar operable by said lever.

7. A typewriting machine having a main frame, a platen carriage supported to travel transversely of the frame, right and left hand margin and tabulator stops on the carriage, an escapement for the carriage, a fixed transversely extending pivot rod held to the frame, an upstanding counter stop for the margin stops pivoted on said rodand held against axial movement, an upstanding counter stop for the tabulator stops pivoted on said rod and held against axial movement by the firstmentioned counter stop, a transversely extending and horizontally swinging lever pivoted on the main frame and having a forked inner end embracing'the first-mentioned counter stop, a margin release key lever fulcrumed on the main frame, a link connecting said key lever to the outer end of said horizontally swinging lever, a second transversely extending and horizontally swinging lever pivoted on the main frame and engageable with a part vof the escapement to free the carriage and having a forked inner end embracing the counter stop for the tabulator stops, a tabulator key lever fulcrumed on the main frame, and a link connecting said tabulator key lever to the outer end of the last-mentioned horizontally swinging lever.

8. A typewriting machine as claimed in claim 7, having a universal bar for actuating the cscapement, and line locking means for the universal bar comprising a latch pivoted on the main frame, an upstanding lever pivoted on the counter stop for the margin stops for actuation by the right hand margin stop, and a link connecting said lever and latch.

9. A t-ypewriting machine having a main frame, a platen carriage, a carriage escapement including a dog rocker, a tabulator key and connections for rocking said dog rocker to free the carriage from control of the escapement, a rock shaft having a tappet ,for rockingthe dog rocker independently of said key and connections,an upstanding rock arm on said shaft having a lateral projection, a space bar, a draw link operable by the space bar having a slot through which said projection extends with the projection normally engaged in the rear end of said slot, a yoke pivoted on said shaft having a tappet behind said rock arm on the shaft and also having an upstanding rock arm, a universal bar, a draw link connecting said universal bar to the rock 'arm on said yoke, a return spring for the universal bar, and a return spring for the space bar.

10.: A typ'ewriting machine as claimed in claim 9, having a right hand margin stop on the carriage, a lever operable by said stop, a pivoted latch on the frame engageable in front of the upstanding rock arm on the yoke, and a link connecting said lever and latch.

11. In a typewriting machine, the combination of a main frame, a platen carriage, margin stops on the carriage, tabulator stops on the carriage, a counter stop for the margin stops, a pivot on the frame on which said counter stop is mounted and held against axial movement, a counter stop for the tabulator stops mounted on said pivot and straddled by and held against axial movement by the first-mentioned counter stop, said counter stops being independently rockable about the axis of said pivot.

HENRY ALLEN AVERY. 

